这条看门狗不好斗，因此正在养狗场受训。The guard dog was now in kennels as it was not aggressive.我们外出时把狗寄养在养狗场。We put the dog in kennels when we go away.一旦你选好了养狗场，别忘了为你的宠物预订。Once you have chosen a kennel, don't forget to make a booking...
交换力的条件与同位旋完全无关.The condition of an exchange force has nothing to do with isospin.同位旋是矢量.Isospin is a vector quantity.由激光发射出的光线都是同位的.All rays leaving the laster are in phase....